Update 3sum.go

Author: izharishaksa

3sum.go

@@ -1,11 +1,12 @@
+//https://leetcode.com/problems/3sum/
+
 package leetcode_solutions_golang
 
 import (
 	"fmt"
 	"sort"
 )
 
-//https://leetcode.com/problems/3sum/
 func threeSum(nums []int) [][]int {
 	sort.Slice(nums, func(i, j int) bool {
 		return nums[i] < nums[j]